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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 Meeran 4055
#2 lydxn 3435
#3 johnblack 2170
#4 fuzzli 1815
#5 kdm 1730
Recent Solves
Network Attacks Barszczyk
Structure of AES cse13224joalozan
Modes of Operation Starter cse13224ccandau
CERTainly not cse13224jwu287
RSA Signatures cse13224ysadaat
Recent Solutions
Encoding Challenge JakubKoz106 0
Public Keys renato_santos10 0
RSA Signatures onuronuronur123 0
RSA Decryption onuronuronur123 0
Favourite byte yanis_k 0

Level Up

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